| Chalcogenide glass possess many unique optical properties,such as wide IR transparency,high refractive index,low phonon energy,a high optical non-linear coefficient,good chemical durability and glass-forming ability and a wide variety of photo-induced phenomena.But there are some bottleneck problems which restricting further research and application of chalcogenide glass.Firstly of all,the rare-earth ions doping concentration is limited.Secondly,the impurities in chalcogenide host glass have a detrimental effect on the IR transparency,the refractive index,the solubility of RE ions and the fluorescence efficiency.In order to obtain high quantum efficiency,it is necessary to reduce the impurities,such as -OH, as much as possible.In the meantime,the visible/infrared transparency of chalcogenide glass is very important for infrared fibre material.Moreover,the poor thermal properties of chalcogenide glass also should be improved for practical use.In view of the basic problems in chalcogenide glass research,this thesis focuses on two kinds of chalcogenide glass as following:(A) We present a novel GeGaCdS chalcogenide glass doped with high Dy3+ concentration for the first time.Their thermodynamic performances,Vickers micro-hardness as well as optical properties were measured and are discussed in detail.Dy3+-doped GaGaCdS glasses would be good potential candidates of chalcogenide glass for lasers,amplifiers,and high brightness sources in the nearand mid-IR region.(B) We present a novel GeGaS-NaF chalcogenide glass with good infrared transparency.The results show that when fluorin is introduced into chalcogenide glass,the infrared transparency is markedly improved,the thermodynamic performance is modified.The Raman spectroscopy indicates that the introduced fluoride could replace the position of S around the Ge and form[=Gaâ†F-Ge=] structural units.These results show that GeGaS-NaF glass would be an excellent candidate for infrared fibre material. |
PDF Full Text Request